An American movie actress, best known for playing dumb blondes, is Scotland Yard's prime suspect when her husband, Lord Edgware, is murdered. The great detective, Hercule Poirot, digs deeper into the case.
Hercule Poirot attends a dinner party in which one of the guests clutches his throat and suddenly dies. The cause seems to be natural until another party with most of the same guests produces another corpse.
To prove that he still is strong and powerful, Philippe Douvier decides to kill Clouseau. Once news of his "death" has been announced, Clouseau tries to take advantage of it and goes undercover with Cato to find out who tried to kill him.